From 289e40b144c32aa1fed6651fbb45990803f98377 Mon Sep 17 00:00:00 2001
From: Alexander Watzinger <alexander.watzinger@craws.net>
Date: Tue, 3 Oct 2023 14:42:17 +0200
Subject: [PATCH] Minor API fix

---
 openatlas/api/resources/util.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/openatlas/api/resources/util.py b/openatlas/api/resources/util.py
index 7c1590ad3..f11aa114d 100644
--- a/openatlas/api/resources/util.py
+++ b/openatlas/api/resources/util.py
@@ -166,7 +166,7 @@ def get_reference_systems(
         links_inverse: list[Link]) -> list[dict[str, Any]]:
     ref = []
     for link_ in links_inverse:
-        if not isinstance(link_.domain, ReferenceSystem):
+        if not isinstance(link_.domain, ReferenceSystem) or not link_.type:
             continue
         system = g.reference_systems[link_.domain.id]
         ref.append({